Excessive sleepiness and hypersomnias
Insufficient Sleep Syndrome
Daytime sleepiness caused by regularly not getting enough sleep. It is common, often unrecognised, and resolves when sleep time increases.
Overview
Insufficient sleep syndrome describes chronic sleepiness caused by consistently sleeping less than your body needs, usually because of work, study, family duties, screens or social life. Unlike insomnia, you can sleep when you have the chance; you are simply not giving yourself enough time.
The AASM and Sleep Research Society recommend that adults get at least 7 hours of sleep per night on a regular basis. Teenagers need 8 to 10 hours. Many people sleep much less during the week and try to catch up at weekends.
Ongoing short sleep is linked to drowsy driving, mistakes at work, weight gain, high blood pressure, diabetes, depression and weakened immunity. The treatment is straightforward in principle: protect more time for sleep.
CDC survey data show that about one in three US adults regularly sleep less than the recommended 7 hours.
Common symptoms
- Daytime sleepiness or dozing off in quiet situations
- Sleeping much longer on weekends or days off
- Needing an alarm and struggling to wake
- Irritability and poor concentration
- Relying on caffeine to get through the day
- Falling asleep within minutes of going to bed
Causes and risk factors
- Long work hours, commutes or multiple jobs
- Caregiving or a new baby
- Late-night screen use, gaming or social media
- Early school or work start times, especially for teens
- Shift work
- Underestimating how much sleep you need
How it is diagnosed
A clinician reviews your sleep history and may ask for a sleep diary or wrist actigraphy for one to two weeks. A pattern of short weekday sleep with longer weekend sleep is typical. Symptoms resolving after a period of extended sleep supports the diagnosis. If sleepiness continues despite adequate sleep, other conditions such as sleep apnea or narcolepsy are investigated.
Treatment options
Extending sleep time
Gradually moving bedtime earlier until you regularly get enough sleep.
Regular schedule
Consistent bed and wake times help sleep become more efficient.
Addressing barriers
Adjusting work, study or caregiving arrangements where possible.
Short naps
A nap of about 20 minutes can help in the short term but does not replace night sleep.
What you can do yourself
- Aim for at least 7 hours a night as an adult
- Set a bedtime alarm as well as a wake alarm
- Move bedtime earlier by 15 minutes every few nights
- Turn off screens 30 to 60 minutes before bed
- Avoid caffeine late in the day
- Never drive drowsy
When to see a doctor
- You are still sleepy after several weeks of getting 7 or more hours
- You have dozed off while driving
- You snore or someone notices pauses in breathing
- You cannot sleep even when you have the time
Frequently asked questions
Can I catch up on lost sleep at the weekend?
Extra weekend sleep can relieve some sleepiness, but it does not fully reverse the effects of chronic short sleep and can shift your body clock later. Regular, sufficient sleep every night is better.
How much sleep does an adult need?
The AASM and Sleep Research Society recommend at least 7 hours per night on a regular basis for adults. Some people need more, especially when recovering from sleep loss.
How do I know if I'm sleep deprived?
Common signs include needing an alarm, sleeping much longer on days off, falling asleep within a few minutes of lying down and dozing in quiet situations. A sleep diary can reveal how much you are really sleeping.
Is drowsy driving really dangerous?
Yes. Sleepiness slows reaction time and can cause microsleeps, brief lapses lasting seconds. If you feel drowsy, stop driving and rest.
Sources
This page is general information, not a diagnosis or medical advice. Read our medical disclaimer.