I am using a Lenovo Thinkpad running Windows 7 Ultimate x32 to operate an astronomical observatory. This requires running a range of software simultaneously. On several occassions, my computer has gone into sleep mode and will not respond to waking requiring a hard shutdown and reboot. This introduces a host of registry errors and stops any astrophotography. I have looked into Event Viewer and all I get is the following entry:
The system is entering sleep.
Sleep Reason: Application API
Why is this happening? What can I do about it?

The system is entering sleep.
Sleep Reason: Application API
Why is this happening? What can I do about it?
My Computer
At a glance
Windows 7 Ultimate x32Intel Core2 Duo CPU T9600 2.80 Ghz4 GbATI Mobility FireGL V5700
- Computer Manufacturer/Model Number
- Lenovo Thinkpad 4058CTO
- OS
- Windows 7 Ultimate x32
- CPU
- Intel Core2 Duo CPU T9600 2.80 Ghz
- Memory
- 4 Gb
- Graphics Card(s)
- ATI Mobility FireGL V5700
- Sound Card
- Sextant 20561 Smartaudio HD
- Monitor(s) Displays
- Lenovo L1900
- Hard Drives
- Internal: 300 Gb
External: Western Digital 4 Tb, Caldigit 4 Tb, Maxtor 250 Gb
- Cooling
- None