How Much Sleep Do You Actually Need? Age-by-Age Guide
The 8-hour rule is a guideline, not a law. Here is what science says for your specific age.
The National Sleep Foundation recommendations: Newborns (0-3 months): 14-17 hours. Infants (4-11 months): 12-15 hours. Toddlers (1-2 years): 11-14 hours. Preschool (3-5): 10-13 hours. School age (6-13): 9-11 hours. Teens (14-17): 8-10 hours. Adults (18-64): 7-9 hours. Older adults (65+): 7-8 hours.
Quality vs Quantity
6 hours of uninterrupted sleep is more restorative than 8 hours of fragmented sleep. Sleep quality depends on: consistent bedtime (circadian rhythm), dark and cool room (65-68 degrees F), no caffeine after 2 PM, no screens 60 minutes before bed, and regular exercise (but not within 3 hours of bedtime).
The Individual Variation
About 5% of adults function optimally on 6 hours (a genetic trait, not a trainable skill). About 5% genuinely need 9+ hours. The remaining 90% need 7-8 hours. If you need an alarm to wake up, you are not getting enough sleep. If you fall asleep within 5 minutes of lying down, you are sleep-deprived.