This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Not sleeping

adj. constant

Not sleeping; ever wakeful.

adj. fully awake

"All that night Saxon lay, unsleeping, without taking off her clothes, and when she arose in the morning and washed her face and dressed her hair she was aware of a strange numbness, of a feeling of constriction about her head as if it were bound by a heavy band of iron."

awake   

lynx-eyed    rabbinal    war-scarred    hawklike    nightlong    devote    unresting    unrelaxing    unchastened    unrested