How many hours of sleep do I actually need?
Most adults need seven to nine hours; over 65, seven to eight. The claimed few who thrive on five hours mostly demonstrate adaptation to feeling bad, not immunity, when tested formally.
The honest self-test: do you wake mostly refreshed without an alarm on free days, and stay alert through afternoon meetings without caffeine rescue? If yes, your current amount fits.
Chronically undersleeping shows up as sugar cravings, low mood, poor immunity and blood pressure creep long before it feels like sleepiness.
Source: National Sleep Foundation, sleep duration recommendations
See a doctor promptly if
- Loud snoring with pauses in breathing, waking gasping, or falling asleep during the day despite time in bed. This suggests sleep apnea and needs assessment
- Falling asleep while driving or operating machinery, or any near-miss from sleepiness
- Acting out dreams, shouting, or physically moving during sleep
- Insomnia with low mood, loss of interest, or any thoughts of harming yourself
- New insomnia with weight loss, night sweats, palpitations or breathlessness lying flat
- Sudden loss of the need for sleep while feeling energetic and full of ideas. This needs prompt medical review
Check your sleep2 min, free, nothing to install
Mind and sleepA private mood check, and guides on anxiety, low mood, ADHD and sleep
Answered by the AskDoc Medical Team · Medically reviewed under our Medical Director, MBBS · How we review
Before you buy anything for sleep
No gadget fixes sleep apnea. But if your score above suggests a sleep study, a simple pulse oximeter can give your doctor useful overnight numbers for under $30.
Buying through this link supports the free library with a small commission. It never changes a pick.
A question about your own situation?
One question, answered personally by a doctor in writing within 24 hours.
People also ask
Health education, not medical advice.