l can not find anything that is left on.

Sounds like a bad alt.

Then you have to get a meter to measure the drain and start pulling fuses to see what cuts it off. If nothing does, then the drain is between the battery and the fuse block, perhaps in the ignition switch.

Take it to a mechanic who can diagnois the problem. It is probably the alternator or the fuel pump relay stuck closed>

Dose this car have a tow bar?
If yes, check the electrical cable that conects to the trailer. Often devolpes shorts after a period of time.

ur car has a battery drain, to find it u need a amp meter, connect u negative lead to the terminal mark comp ( on the amp meter) connect the positive lead to the terminal mark amp, select 10 or 20 amps, disconnect negative cable, connect the positive lead ( amp meter ) to the negative cable ( battery cable ) & connect the negative lead ( amp meter ) to negative battery post, u should read 0.5 amps or less if u have a higher reading start pulling fuses one by one until u read ) 0.5 amps. if u read 0.5 or less replace battery.

Most power drains r caused by simple often used loads.

Here r some common things to check.
1. Glove box lamp staying on with the glove box door fully shut. Check this one in the dark & see if u can see any light .

2. trunk light staying on
3. Vanity mirror lights staying on
4. Dome lights not shutting off
5. Coolant fan not shutting off
6. Fuel pump staying energized
7. Aftermarket radio/alarm drawing too much amps
8. blower motor fan staying on
9. Door pin switches for interior lights- when the vehicle cools down at night the body metal contracts & if the pins were barely making contact with the door then when the metal contracts a larger gap occurs & the interior lights r triggered while u r sleeping.

10. Faulty alternator diodes allowing the battery to discharge through the alternator

this is a forum, and is very informative, go here, they will answer all of your questions. :) Make sure you look under 4.6 technical talk. :)