Choose up to three.
Less sleep, more sleep, or a changed sleep scheduleLess sleep, more sleep, or a changed sleep schedule
More stress than usual, or a stressful period had just endedMore stress than usual, or a stressful period had just ended
Food, alcohol, a missed meal, or a supplement changeFood, alcohol, a missed meal, or a supplement change
Heat, exertion, travel, less fluid, or a major salt changeHeat, exertion, travel, less fluid, or a major salt change
More reclining or a different neck or sleep positionMore reclining or a different neck or sleep position
A menstrual-cycle or hormone changeA menstrual-cycle or hormone change
A weather change, sensory overload, illness, or allergy flareA weather change, sensory overload, illness, or allergy flare
Nothing obvious was differentNothing obvious was different
Something elseSomething else