If you get a chance, try existing for a while. Just a while. It doesn't have to be long, perhaps ten minutes or half an hour and in that time just exist. Don't do anything else, simply be aware that all you have to do is exist and take pleasure in that for a while. This sensation is felt best when it's dark, under the folds of many blankets on a night when you're drifting off in a way that is much more pleasurable than other nights. Things seem a little more comfortable and warm and safe and the burden insomnia is yesterday and the things you have to do are tomorrow but now all that you must do is exist in this moment and you are able to be in this moment without distraction or pain or discomfort. Simply experience your existence in a state where all that you can do or should do is lye down and fade into deep nothing.