Remembering all that God has done for you
If you wake in the night, like the writer of Psalm 77, panicking over things that worry you, then remember all that God has done for you throughout your life, from your birth to the present day. You might like to try a fun (but nevertheless serious way) of thanking God - go through the alphabet. For example:
A is for Alpha: Thank you God for my beginning.
B is for ............: Thank you God for ..........
X and Z might get you stuck, on the other hand you might have fallen asleep by then! I am sure God will forgive you, and give you a quiet night.