Most 70-year-olds do best with roughly 1 to 2 hours of deep sleep per night, though the exact amount varies by person and by total sleep time. Deep sleep (also called slow-wave sleep) naturally declines with age, so it’s common for older adults to get a smaller percentage of deep sleep than they did in midlife.
Instead of chasing a perfect number on a sleep tracker, focus on whether sleep feels restorative: waking up reasonably refreshed, having steadier energy, and maintaining mood and memory day to day. If total sleep is short or fragmented, deep sleep often drops too.
Older adults commonly spend about 10% to 20% of their night in deep sleep. If someone sleeps 7 to 8 hours, that can land around 45 to 90+ minutes, sometimes a bit more. Some healthy seniors may get less and still function well, while others need closer to the higher end to feel their best.
Deep sleep supports physical repair, immune function, and aspects of memory consolidation. If deep sleep is consistently very low and paired with symptoms like loud snoring, gasping, frequent awakenings, morning headaches, or excessive daytime sleepiness, it may signal a sleep disorder worth discussing with a clinician.
Keep a consistent wake time, get morning light exposure, and stay physically active (earlier in the day if possible). Limit alcohol close to bedtime, keep the bedroom cool and dark, and avoid long late-afternoon naps that can reduce sleep pressure at night.
For a broader look at age-based sleep needs and how deep sleep changes over time, visit the main article here.
Common signs include frequent nighttime awakenings, needing a long time to fall asleep, waking up unrefreshed, and feeling sleepy or irritable during the day. Memory lapses, reduced concentration, and increased reliance on naps can also be clues.
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