Why do I wake up at the same time every night?
Do you find yourself always waking up in the middle of the night or much earlier than you wanted to?
There are several reasons this could be happening, and there are ways to make it stop if it’s become disruptive to your sleep.
Why it might be happening
Your sleep patterns
Our sleep pattern mostly depends on our circadian rhythm and homeostatic sleep drive (the bodily mechanism that regulates sleeping/waking rhythms).
Throughout the night, our sleep cycles between rapid-eye movement (REM) sleep and non-REM sleep. Each stage of sleep has a different threshold for how easily it is to be woken up. One likely explanation for waking up at the same time each night is that you go to sleep at the same time and then, at the same time each night, you reach a lighter stage of sleep and wake up.
We’re also more likely to remember waking up if it’s closer to the time we normally get up for the day.
Anxiety or depression
Anxiety can make it hard to get to sleep in the first place (that’s called sleep-onset insomnia). But it can also cause you to wake up in the middle of the night and have trouble getting back to sleep (called middle insomnia, or sleep maintenance insomnia).
Terminal insomnia, which happens when you wake up before your ideal wake-up time and just can’t fall back asleep, may be a sign of depression.
Experiencing acid reflux or just being too hungry or too full can lead to nighttime awakenings.
Hormones and blood glucose levels
Waking up often in the night could signal that your hormone or blood glucose levels are fluctuating. If you have diabetes, check with your doctor to ensure that your blood sugar is properly controlled.
Other medical causes
Your frequent wakeups could be signaling something else entirely, which is why it’s important to check with your doctor if this happens too often. Sleep apnea, menopause or thyroid dysfunction are among other medical causes for nighttime awakenings.
Is it normal?
Most of us wake up at least once a night but should be able to return to sleep with little effort.
If you’re waking up for prolonged periods at least three nights a week, and it continues for at least three months and results in your being unable to function properly during the day, then this is called chronic insomnia.
Having chronic insomnia is different from just being a short sleeper – some people are able to function well and feel refreshed after regularly sleeping six hours or less each night.
If your awakenings occur at least three nights a week for at least three months and result in daytime impairment, check with your doctor. It helps to keep a journal about these awakenings and how you feel when you wake up. Try answering some of these questions:
- Did you have a nightmare?
- Are you too hot or too cold?
- Are you having hot flashes or heart palpitations?
- Are you hungry or did you eat too much?
- Did you take a nap earlier or otherwise change your sleep routine?
How can I keep these awakenings from happening?
Besides keeping a journal and talking with your doctor about your concerns, it’s important to practice “sleep hygiene.”
Try these sleep hygiene tips:
Rita Aouad is a psychiatrist and sleep medicine specialist at The Ohio State University Wexner Medical Center.