Good explanation Ulak. I just want to add abit.

Aheste çek kürekleri.

Yes, In fact there are two independent sentences seperated with comma.

Aheste çek kürekleri. [ inverted sentence [ the verb is in unusual place, not in the end]

and it is also "imperative" sentence.

Predicate is ---> çek [çekmek]

subject is  ---> hidden "YOU"

Object ---> kürekleri

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mehtap uyanmasın  [ imperative sentence and also intransitive verb [uyanmak] ]

Mehtap ---> subject

uyanmasın --> Let it [mehtap] not to wake up [ imperative predicate]

uyan + ma [negative marking] + sın [imperative marking for the 3th person [it] ]

Object ---> Because it is an intransitive verb, it does not take an object.

 because there is 2 predicates