Antonyms of adj sleepless

2 senses of sleepless

Sense 1
insomniac, sleepless, watchful -- (experiencing or accompanied by sleeplessness; "insomniac old people"; "insomniac nights"; "lay sleepless all night"; "twenty watchful, weary, tedious nights"- Shakespeare)

INDIRECT (VIA awake) -> asleep -- (in a state of sleep; "were all asleep when the phone rang"; "fell asleep at the wheel")

Sense 2
lidless, sleepless -- (always watchful; "to an eye like mine, a lidless watcher of the public weal"- Alfred Tennyson)

INDIRECT (VIA alert) -> unalert, unwatchful, unvigilant -- (not alert to what is potentially dangerous)

Similarity of adj sleepless

2 senses of sleepless

Sense 1
insomniac, sleepless, watchful -- (experiencing or accompanied by sleeplessness; "insomniac old people"; "insomniac nights"; "lay sleepless all night"; "twenty watchful, weary, tedious nights"- Shakespeare)
       => awake (predicate) (vs. asleep) -- (not in a state of sleep; completely conscious; "lay awake thinking about his new job"; "still not fully awake")

Sense 2
lidless, sleepless -- (always watchful; "to an eye like mine, a lidless watcher of the public weal"- Alfred Tennyson)
       => alert (vs. unalert), watchful -- (engaged in or accustomed to close observation; "caught by a couple of alert cops"; "alert enough to spot the opportunity when it came"; "constantly alert and vigilant, like a sentinel on duty")