Somnolent
Drowsy, sleepy-adj
Somn
Sleep
Sopor
Sleep
Soporific
Causing sleep or fatigue-adj
Sopor
Sleep, drowsiness-noun
Lang
To be weak, to be faint
Languid
Lacking energy, weak-adj
Languish
To waste away- verb
Languor
Lack of physical or mental energy- noun
Vigil
Watchful
Vigilant
On the alert, watchful-adj
Vigilante
Someone who takes law enforcement into his or her own hands- noun
Quies
To rest
Acquiesce
To give in- verb
Requiem
A song or a religious service for the dead or lost-noun
Quittance
A repayment, compensation-noun