One would consider that a feature of insight meditation like the one you went through would prepare you to sleep as your object of meditation will be 'sleeping’, and continue to silently and passively observe your mental formations, feelings, breath, body as the body rests on the sleeping mat and follow it till the final in or outbreath lets you close your eyes. Then when you wake up, notice the breath (in or outbreath) you woke up in, refreshed and recharged. Your sleep is nothing but meditation, only you let the observation to gradually fade.
You can still give it a go, :-), stilling your mind, noting how the chatty busy mind progressively drifts off as breath slows as you continue to watch your breath, feeling, mental states, and not arouse your awakening mental objects (i.e, do not investigate, or do not persist at it, but feel the subtle joy). The bed as your cushion, :-)
At least for me that was a great outcome of an insight meditation retreat, both while in it and afterwards.