hit the hay

sack out

Sleep, slangily

• turn inSubmit or sleep
• conk outCease functioning suddenly
• forty winksBrief informal nap

shut-eye · sawing logs · kip · call it a night · crash · zonk out

slumber

Light, restful unconsciousness

• dozeBrief light rest
• snoozeLight brief sleep
• napBrief daytime rest

drift off · fall asleep · bedtime · drowse · nod off · dreamland · shuteye · crash · repose · lights out

relaxation

State of being unwound

• unwindRelease accumulated tension
• downtimePeriod of non-operation
• reposePeaceful stillness or calm

respite · recuperate · recharge · decompress · peace · quiet · tranquility · ease · comfort · siesta

nightfall

Onset of darkness

• duskDimming after sundown
• twilightLight after sunset
• eveningLate day period

end of day · wind down · lights out · wrap up · curfew · closing time · after dark · moonrise · night owl

exhausted

Utterly depleted of energy

• wearyDeeply tired, spent
• fatiguedDrained of energy
• drainedEmptied of resources

worn-out · lethargic · spent · knackered · beat · bushed · tuckered out · dead tired · wiped out · ready for bed

• sleepsleep, sleeping, nap, doze, slumber
• falling asleepfell asleep, dozes, dozed off, nods off, nodded off
• farm idiomscream of the crop, put the cart before the horse, till the cows come home, buy the farm, put out to pasture
• idiomstime flies, seize the day, ring a bell, break a leg, barking up the wrong tree
• folk sayingsproverb, adage, maxim, folk saying, old saying
• Horse Idiomshold your horses, dark horse, high horse, straight from the horse's mouth, horse sense