To fight fatigue and function better on less sleep, open your curtains the minute you wake up.
Did you spend the night tossing and turning? Luckily, one restless night isn’t likely to hurt your health — though you may not feel so energetic the next day. To feel better on less sleep, open your shades as soon as you wake up (even if you just crawl back into bed). Or, even better: Go outside for a walk. A big burst of sunshine first thing in the morning (even on a cloudy day) can reset your internal clock, wipe away grogginess, and help you function better throughout the day.
source: Cleveland Clinic Wellness