A lot of people seem to have trouble with windows 98 power management.
My computer tends to go into a deep sleep that may wake when I press
a key but the scheduler is unable to wake the system to run tasks.
I would suggest that you check the power management trouble shooting
information on Peter Forrest's web site.
http://www.pcforrest.co.uk/
There is a power trouble shooting area on the microsoft site.
You might also try asking in the usenet group
microsoft.public.win98.power_mgmt
Also from a post by Peter Forrest in alt.windows98
Power Management related links.
Try the APM Troubleshooter. There is a copy on your Win98 CD
but there is a better one available from Microsoft's web site:
http://support.microsoft.com/support/windows/tshoot/apm98/
Troubleshooting Power management lack of Suspends and Resumes
http://support.microsoft.com/support/kb/articles/q185/9/49.asp
Computer Hibernates When Standby Is Pressed
http://support.microsoft.com/support/kb/articles/q190/7/15.asp
Hard Disk Is Active After Windows 98 Shutdown
http://support.microsoft.com/support/kb/articles/q189/5/76.asp
Monitor Is Energy Star Compliant Check Box Is Unavailable
http://support.microsoft.com/support/kb/articles/q191/3/30.asp
Computer Does Not Resume from Standby When USB Device Connected
http://support.microsoft.com/support/kb/articles/q189/5/91.asp
Cannot Suspend Computer If Secondary IDE Drive Is Not Present
http://support.microsoft.com/support/kb/articles/q189/5/77.asp
Computer Is Unable to Go to Standby Mode
http://support.microsoft.com/support/kb/articles/q189/6/19.asp
Standby Missing From Windows Shutdown Dialog Box
http://support.microsoft.com/support/kb/articles/q188/1/34.asp
Computer with Accelerated Graphics Port Hangs After Suspend
http://support.microsoft.com/support/kb/articles/q195/5/64.asp?FR=0
"Hot Corner" Features Do Not Work in Windows 98
http://support.microsoft.com/support/kb/articles/q189/6/89.asp
Error Message: Error Loading Powrprof.dll
http://support.microsoft.com/support/kb/articles/q188/2/13.asp
IBM Computer with IDE DMA Hard Disk Hangs When Resumed
http://support.microsoft.com/support/kb/articles/q193/4/73.asp
Auto Insert Notification May Prevent Automatic Suspend
http://support.microsoft.com/support/kb/articles/q161/6/42.asp