Nodding off and Turn in

Turn in and nodding off are semantically related. in suspend consciousness topic. In some cases you can use "Turn in" instead a verb "Nodding off".

Turn in verb - To give (something) over to the control or possession of another usually under duress.

Nodding off and turn in are semantically related. Sometimes you can replace term "Nodding off" with "Turn in", this phrasal verbs are similar.