In a sleepless manner.

In a sleepy manner.

The property of being sleepy.

(poetic) asleep / (poetic) sleepy

A seat, on an aircraft etc, that can be reclined to form a bed. / (US) A small compartment on a long-distance truck in which the driver can sleep when taking a break.

superlative form of sleepy: most sleepy

comparative form of sleepy: more sleepy

(archaic) second-person singular simple present form of sleep

plural of dark sleeper

Odontobutis obscura, a freshwater goby found in East Asia