Why do I wake up at 3am? How to find your pattern with a two-week sleep diary

What counts as a problem

Brief wakings are a normal part of sleep. You cycle through stages several times a night, you "usually have more REM sleep later in the night," and you "may wake up briefly between cycles" (NHLBI).

It becomes a problem when you can't get back to sleep. The NHS lists waking several times a night, and waking early and not getting back to sleep, as insomnia symptoms. Insomnia that lasts three months or longer is called long-term insomnia (NHS). The US National Heart, Lung, and Blood Institute describes chronic insomnia as happening three or more nights a week for three months or longer (NHLBI).

A rough week now and then is normal. A pattern that keeps showing up is worth two weeks of attention.

What to write in a sleep diary

The American Academy of Sleep Medicine recommends "a two-week sleep log to identify general patterns," and its patient site says a typical sleep diary covers two weeks (AASM). The research-standard Consensus Sleep Diary is filled in each morning, within an hour of getting up (Carney et al.).

Here's a simple version built from it and the NHLBI's suggestions. Fill in the evening column the next morning too:

A few tips make it easier to keep and more useful:

• Fill it in once, in the morning. Estimates are fine. You're looking for patterns, and precision doesn't add much.
• Don't check the clock in the night to fill it in. The NHLBI notes that watching the clock can raise your risk of insomnia. Rough guesses in the morning work better.
• Track the evening too. If there is a pattern, the evening details are where you'll see it side by side.

The usual suspects to look for

These are the common causes the NHS and sleep research point to. Your diary can show which ones tend to line up with your bad nights.

• Alcohol. A research review found sleep is disrupted in the second half of the night after drinking near bedtime (Thakkar et al.). Sleep specialists don't recommend it as a sleep aid.
• Caffeine timing. The NHS suggests no tea or coffee at least 6 hours before bed. In a small study, 400 mg of caffeine taken 6 hours before bedtime still disrupted sleep (Drake et al.).
• Stress, anxiety, or low mood. Among the most common causes on the NHS list.
• Your room. Noise, light, and a room that's too hot or too cold.
• Reflux. Heartburn is often worse lying down; the NHS advises not eating within 3 or 4 hours of bed (NHS).
• Waking to pee. Caffeine and alcohol "with or after dinner" can cause it, and so can some medicines and conditions (MedlinePlus). It's also one of the signs of sleep apnea the NHLBI lists (below).
• Hormonal changes. Pregnancy and menopause can both disrupt sleep, the NHLBI notes.

A diary can miss things too. In that caffeine study, diaries picked up the disruption when caffeine was taken at bedtime or 3 hours before, but when it was taken 6 hours before bed, "only the objective measure detected differences" (Drake et al.). If your diary shows no clear pattern, that's still useful to bring to a doctor.

What to do when you wake up

Sleep specialists suggest the same few things:

• Leave the clock alone. The NHLBI notes that watching the clock can raise your risk of insomnia, and you can estimate the time in the morning.
• If you can't get back to sleep, get up. Insomnia treatment includes "getting out of bed if you cannot sleep" (NHLBI). The AASM's rule of thumb is about 20 minutes, then a quiet activity without a lot of light (AASM). NINDS suggests "reading or listening to calming music, until you feel tired" (NINDS).
• Go back to bed when you feel sleepy. Going to bed only when sleepy, and keeping the bed for sleep, are part of the same approach, called stimulus control.

If waking has become a pattern that lasts months, ask your doctor about cognitive behavioral therapy for insomnia (CBT-I). The AASM gives it a strong recommendation for chronic insomnia in adults (AASM 2021), and the NHLBI says it's "usually recommended as the first treatment option for long-term insomnia."

If you try a change

The NHS's self-help advice for insomnia includes avoiding tea or coffee in the 6 hours before bed, and its list of causes includes noise and a room that's too hot or too cold. If you try one, change one thing at a time and keep the diary going, so you can see what happened afterward. A pattern is something to discuss with your doctor; it doesn't prove the cause. Here's how to tell whether a change is working.

Sleep varies from night to night, so compare patterns across several nights rather than judging by one. And if you're cutting back on caffeine, withdrawal can make the first few days feel worse before they feel better.

Start today

Print a page

The printable sleep journal gives each night one page: last night's times at the top, filled in once in the morning, then the evening one line at a time, with times. A two-week try sheet comes with it. To work out the sleep-log numbers, the sleep diary page walks through them with an example.

Or ask your AI assistant to set it up

If you already use an AI assistant, this prompt turns the diary above into a two-week plan. It works in any capable assistant. Check its privacy practices before you share health details.

Help me keep a two-week sleep diary to understand why I wake in the night, and then test one change. Help me with the method only. Don't diagnose me or suggest medicines, supplements, or sleep aids. If I mention loud snoring, my breathing stopping or gasping in my sleep, feeling very sleepy during the day, low mood that won't lift, or thoughts of harming myself, tell me to see a doctor first, and for thoughts of harming myself, to call or text 988.

1. Ask what's happening, and write it as one question in my words, like "Why do I keep waking around 3am?"
2. Give me a morning format, filled in once within an hour of getting up, with estimates: when I got into bed, about how long it took to fall asleep, how many times I woke and roughly for how long, when I woke for the day and got up, and how well I slept (poor, fair, or good).
3. Give me an evening format, one line per entry with the time: caffeine, alcohol, dinner, exercise, anything stressful, and any medicines.
4. Remind me to leave the clock alone at night.
5. After two weeks, give me questions to ask of my notes: What do the nights I woke have in common? What was different about the evenings before them? Which nights broke the pattern?
6. Help me choose one change to try for about two weeks, such as no caffeine in the six hours before bed, and the date I'll look back. One change at a time.
7. At the look-back, if I share my notes, count the mornings I woke in the night before and during the try, quote the entries you counted, and call it: helped, no clear effect, made it worse, or needs another round. Remind me that a pattern is a clue to discuss with my doctor, and say what my notes can't tell us.

What it looks like in Kasane

Kasane is the journal version of this diary. It's on the App Store for iPhone, starting with a free week: download Kasane. Here's a fictional example, step by step: Dana, who's been waking around 3am most nights since July.

1. Last night is already there

With Apple Health connected, last night is there when she opens the app: when she slept, for how long, and five overnight readings. The rest is hers to write, one line at a time, the way she'd text it: how long it took to fall asleep, how the night felt, coffee at 4.

2. She names the question, and one change

3. Her journal connects the dots

4. She looks back

Sleep varies from night to night, so the look-back compares fourteen mornings with fourteen mornings.

5. She takes it to the visit

The question stays open until the waking settles or her doctor has the diary.