Answer: fitful

AnswerCrossword Clue
FITFULSporadic
FITFULLike a restless sleep
FITFULRestless
FITFULIntermittent.
FITFULLike a bad night's sleep
FITFULOff-and-on
fitfulirregular
fitfulmarked by sudden impulses