Wakeful a. : Not sleeping; indisposed to sleep; watchful; vigilant.

Example:
How long Wakeful periods for 7 week old baby?

Taxonomy
HMS Wakeful, Mk, 1944, 1943, 1945, destroyer, Destroyer Flotilla, 1941, free encyclopedia, scrap, fire control, air raids, escort, air attacks, 1942, F159, Admiralty, kt.

Defination from the web:
Wakeful was a W-class destroyer ordered from Fairfield Shipbuilding and Engineering Company, Govan, Glasgow on 3 December 1941 as part of the ... During August 1945 Wakeful was on escort duties during the Royal Navy and United States Navy's air raids on Hokkaido and North Honshu. ...