My eyes are awake through the night watches, that I may meditate on Your word. Psalm 119:148 (NKJV)
The psalmist and a lot of us have the same issue here. An inability to sleep. He uses that time to meditate on God’s word.
Sometimes, I think of words that describe God. I try to do this exercise in alphabetical order.
Other times, I think of the many things that He had done for me for which I am thankful, those things that we sometimes take for granted. My mental list includes fans and air conditioners(in the summertime), a roof that doesn’t leak, central heat (in the winter time), food for my special diet, an enclosed porch where I can sit when it is nice outside. My husband who loves me, a son who also loves me.
I have had times when a hymn plays through my head and stays for a while. Some days, that hymn is with me when I awake.
God has been very generous to us, His children.