Windows 7 suddenly and unexpectedly goes into sleep mode

tomstep11

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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?

:mad:
 

My Computer 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
I can add that the cause appears to be "Event 42, Kernel-Power".
 

My Computer 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
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