you possibly have something draining the battery when the car is shut off, with the car shut off pull the positive cable off the battery and then just touch the cable to the positive post of the battery and see if you get a spark, if you get a spark you have something electrical draining the battery.
that means your battery will be dead in the morning
replace it
Either the battery has a dead cell, which will require you to replace it, or something is on pulling power from the battery. Disconnect the negative cable and leave it off overnight. If the battery is dead the next morning the battery is defective. If not, then find out what is pulling power from the battery. Ignition switch may be defective.
Dead cell in battery or something is on pulling power from the battery. Disconnect the negative battery cable overnight with the battery fully charged (12.6 volts). If the battery is dead the next morning it has a dead cell and needs replacing. If however the battery is still fully charged then a light is on somewhere or a relay is stuck closed.
Something is causing a drain on the battery even with the vehicle off and nothing turned on. A good mechanic can do a drain test on the battery to see what may be draining the charge. A dead cell in the battery itself will also cause the battery to go dead. Disconnect the negative battery cable overnight and if the battery is dead the next morning it has a dead cell and must be replaced. If not look for a light that is on or a relay that is stuck.
you pull the release latch on the drivers side of the instrument cluster, it is all mechanical and does not need battery power
<improved answer>Just to correct the old answer, if the CMOS battery is dead, then the computer will not turn on in order for you to reenter it the next morning. It means that the CMOS battery is getting weak, and yeah, you could replace it. <old answer>It is most likely that the CMOS battery is dead. Replace it.
Either the battery has a dead cell, which will normally drain it overnight, or something is on pulling power from the battery. If the battery has a dead cell it will have to be replaced. The easiest way to determine this is to fully charge the battery and then disconnect the negative cable overnight. If the battery is dead in the morning it has a dead cell. You may not even be able to charge it with a dead cell. If the battery is still fully charged the next morning then you have another problem. Check all the lights on the vehicle. Under hood, trunk, dome, curtorsey, glove box, etc. One of them may be staying on. Also check your brake lights. If you find no lights are on then you may have a relay that is sticking. Can be power windows, locks, seat, etc.
It can be a dead cell in the battery causing the drain. Disconnect the negative battery cable overnight. If the battery is dead the next morning it has a dead cell and needs replacing. It can also be any light that is staying on overnight. Under hood, trunk, glove box, dome light, etc. It can also be a relay that is stuck.
dead battery, or a bad ignition control module inside the distribureator.
When your phone is going dead, keep it on until it shuts off. Then charge your phone overnight leave it in until morning. That helps the battery on your phone.
check battery cables, if ok, there may be a parasitic draw on the battery, take it to a professional