Staying hydrated is among the tips the Boston Globe offers for better sleep.

Even mild dehydration can zap energy, memory, and attention, according to a 2016 study published in the American Journal of Clinical Nutrition. Older adults can have a tougher time staying hydrated, in part because the mechanism that triggers thirst might become less efficient with age.

To compensate, make it a point to drink at regular intervals throughout the day, beginning in the morning.

Coffee and tea count toward your hydration (they have only a mild diuretic effect, if any), as do foods with a high water content, such as soup and most fruits and vegetables.