In order to stay warm you will need a lot of clothes. When people abandon ships they always forget to grab clothes. Then if they get rescued they don’t ever have any clothes. Clothes don’t just keep you warm, they protect you to. From strong wind and protect your face from flying objects.
Signaling is something you could do to help you get rescued. If you have a flash light during the night if you see any human contact then click your flash light on and off. These ideas will help you if you are ever stranded in the ocean.