reboot after puting to sleep mode,how to fix it?

[paparazzo79]

I'm having my acer notebook model aspire 5736z and I nticed that when I put it to sleep mode and then run my notebook again hiting ENTER key it reboots
It's very frustrating,and I don't think it's normal.How can I fix it,to get it back to desktop again??
I'm running Windows 7 Ultimate with SP1.

 

[AddRAM]

Sounds like it`s going into hybernation mode and not sleep mode, check your power settings in the contol panel and check what you have it set to.

 

[paparazzo79]

I set everything to sleep,I mean it was by default.
Do you need event log or some log files?