I would notice how my body felt, do I need a glass of water, do I need a quick stretch, just notice it and go from there. If your restless try some stretching or yoga, if your mind is restless, try some breathing exercises or meditation in bed. Afterwords you should feel calm and centered ready to enjoy a good nights rest. I hope this is helpful to you and sweet dreams!
Sometimes I read a book, sometimes I reflect on the good things that happened that day, sometimes I listen to my favourite music, and sometimes I think of the good times I had with my family during the last vacation.