fitful
adjective
[ ˈfɪtfʊl ]
• active or occurring spasmodically or intermittently; not regular or steady.
• "a few hours' fitful sleep"
Similar:
intermittent,
sporadic,
spasmodic,
broken,
disturbed,
disrupted,
patchy,
irregular,
variable,
uneven,
unsettled,
disconnected,
unsteady,
on and off,
off and on,
restless,
sleepless,
wakeful,
insomniac,
tossing and turning,