Levono support has updated BIOS and power management drivers/software dated the beginning of November. If you haven't updated these, you may want to try them.
In the Levono support community, I did see some posts about erratic battery status and some other power issues, but not related to sleep. In my experience, some equipment/OS combinations just don't wakeup in a friendly mood.
It sounds like Windows 7 has some issues with Power Management, so you may find these helpful if you haven't already tried them. Hope this helps.
How to troubleshoot power plans in Windows 7
Power Plans Frequently Asked Questions
Configure a Power Plan Item (Windows Vista and later)
Power Policy Settings
Troubleshoot Power Problems