Lifestyle
Sleep Calculator
Recommended Bedtimes
Most adults need 7–9 hours (5–6 complete cycles). Consistency in sleep/wake times improves sleep quality.
FAQs
What sleep duration is normal for adults?
Most adults aged 18–60 need 7 or more hours of sleep daily. Adults aged 61–64 generally need 7–9 hours, and adults 65+ generally need 7–8 hours.
Is sleeping less than 6 hours risky?
Regularly sleeping less than the recommended range may affect energy, mood, focus, metabolism, heart health, and immune function. One short night is common, but repeated short sleep should be addressed.
Why does the sleep calculator use sleep cycles?
Sleep often moves through cycles of lighter sleep, deeper sleep, and REM sleep. Waking near the end of a cycle may feel easier than waking from deep sleep.
Is sleeping too much also a concern?
Occasional long sleep can happen after stress or sleep debt, but regularly needing much more sleep than usual may signal poor sleep quality, sleep apnea, depression, medication effects, or another health issue.
