For me, the term roosting a bird has to do with going in the evening just at sundown and listening for birds to fly up so you know where to start the next morning. You could do this passively just listening, or you could owl trying to get one to gobble just before black dark. Not a lot of point in continuing once black dark as I rarely hear one gobble in total dark.
Same goes for in the morning, which I would call locating, not roosting. Not a lot of point in owling till light begins to break because again, I have rarely heard a bird gobble in total darkness. The exceptions I have heard have been on bright moonlit mornings and lightening storms.