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How Much Sleep Should Men Get? | Rules, Ranges, And Fixes

Most healthy adult men need 7–9 hours of nightly sleep; older men often do well with 7–8, and heavy training or shift work may add 30–90 minutes.

Most adults feel best with 1–2 hours of deep sleep (15–25% of a 7–9-hour night), with more in childhood and less with age.

Newborn daytime sleep changes widely; across 24 hours most need 14–17 hours total, split into many short daytime naps with feeds between.

Infants need 12–16 total hours of sleep per day (including naps), while newborns average 14–17 hours, based on AASM and CDC guidance.

Most treated drinking water is healthy at pH 6.5–8.5; this range limits corrosion and taste issues rather than setting a strict health limit.

Toddlers need 11–14 hours of total sleep per day, including naps; most 1–2-year-olds do best with one midday nap.

For drinking water TDS, 50–300 mg/L usually tastes fresh, and under 500 mg/L meets EPA’s aesthetic guideline; WHO rates under 600 mg/L as palatable.

For creatine use, drink about 3.7 L for men or 2.7 L for women daily, and add 0.4–0.8 L per exercise hour based on sweat loss.

Most adults can estimate water needs by body weight, then check thirst, urine color, climate, and activity to fine-tune intake.

Most adults need 600 IU (15 mcg) of vitamin D daily; adults over 70 need 800 IU (20 mcg), unless a clinician advises a different dose.