I wake up in the mornings and there's no hot water . In the evenings its warm but not as hot as it can usually get.

How is your water heated, and what sort of room heating system do you have too? Is this your house, or an apartment or condo? Are you in a climate that is now cold, and the heat is on?

Is there heavy usage during the day? Has it always been like this or is thism something new? Gas or electric? How many members of your family shower at night? What size is your heater and how many people ( male/female) in your family. Back to you, Tom