The month of May, observed to raise sleep quality awareness.

To sleep very well and untroubled.

To change the clocks forward by one hour for daylight saving time; the "spring forward" in spring forward, fall back.

(colloquial) A period of good sleep during a particular night.

(idiomatic) To leave things as they are; especially, to avoid restarting or rekindling an old argument; to leave disagreements in the past.

To be formally, but not actually, equal under the law, due to circumstances being ignored.

A circadian rhythm sleep disorder in which the subject falls asleep some hours after midnight and has difficulty waking up in the morning.

Alternative form of let sleeping dogs lie

(figuratively) To remain vigilant at all times, especially by remaining partially awake or sleeping only lightly so as to avoid being caught off guard.

plural of delayed sleep phase disorder