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How big is your turtle? 7 inches
How long have you had it? almost a month

What is the water temperature? 80 but when its night 65
Did you use a thermometer?no
Are you using a water heater?no
How much water is in there? 80 gallon
Are you using a water conditioner? no
Are you using any filtration? yes

What is the basking temperature? 90
Is there a basking light?no
Is there a basking platform that is easy to climb on?yes
What kind is it or what is it made out of? wood
Is there a UVB light?no

What have you been trying to feed it? food pellets, liver, veggies, carrot, pear
When was the last time your turtle ate? 2 days ago ( 08/07/11)

How big is the tank/pond/enclosure? holds 100 gallon
Is the tank near a window? no
Is the tank in a room with a lot of activity? no

Have you read the Basic Care section? yes
Have you searched the forums for similar situations?yes

Is there any other unusual activity/symptoms?no

So my turtle lives outside in a pond now when its night he always climbs out of the water to sleep and sometimes he sleeps in the day also in a corner not in the water why??

They have to regulate their temperatures. So if the water is to cool at night he may come out to warm up. Same for during the day. If the water is to warm he may need to come out to cool down. Is the pond in full sun or full shade?

Can you post a picture of the pond? Can you use thermomters to verify the temperatures?