Overview
- Clinicians describe holiday schedule shifts as a form of social jet lag driven by later bed and wake times, reduced morning light, more evening screens, heavy dinners and alcohol.
- Current advice limits schedule changes to 1–2 hours, favors early natural light, keeps meal timing steady, moderates late heavy eating and alcohol, and cuts screens during the final pre‑bed hour.
- SEPAR specialists warn that disrupted sleep increases fatigue and irritability and can aggravate obstructive sleep apnea, urging a two to three hour gap between dinner and bedtime.
- Evidence syntheses recommend short early‑afternoon naps of about 10–30 minutes for recovery, cautioning that longer or late naps increase disorientation and can impair nighttime sleep.
- A large observational analysis from Flinders University of more than 70,000 adults reports that sufficient nightly sleep of roughly 7–9 hours contributes more to next‑day vitality than exercise and is linked to greater physical activity the following day.