sleepless · adjective /ˈsliː.pləs/
Word family
Nouns: sleep, sleeper
Adjectives: asleep, sleepless, sleepy
Verbs: sleep
Adverbs: sleepily
a sleepless night
C1 a night when you are not able to sleep
Dictionary example:
He'd spent a sleepless night worrying about his exams.
Learner example:
Most of the rooms we stayed in did not have air-condition[ing], which caused many sleepless nights to the majority of us due to the intense heat. (Certificate in Advanced English; C1; Portuguese)
