Denotes a state of drowsiness; can behave as countable or uncountable.
She lay in half-sleep, aware of the birds but unable to open her eyes.
Она лежала в дремоте, слышала птиц, но не могла открыть глаза.
Intransitive verb meaning ‘to sleep lightly or in a semi-conscious state’.
He half-slept through most of the flight.
Он дремал большую часть полёта.
Attributive use describing a state that is neither fully awake nor fully asleep.
In a half-sleep stupor, he mumbled a reply.
В полусонном ступоре он пробормотал ответ.