Existing users, 
I've used is successfully a few times in the past (including v1.5.1). Recently I updated Mac OS X to 10.3.7 (and 10.3.8) and SleepLess won't launch. There is no record in the Console or System logs, nor is there a crash report. I tried opening it as root and as a new (virgin) user to no avail. I also down-graded to Sleepless v1.5.1. Same result. Thus, I'm guessing that the recent OS releases have changed something that interferes with SleepLess. I hope the author is aware of this.
SleepLess
Prevents sleep without changing system settings.
Version: 2.7
Seems to have stopped Working with Mac OS X 10.3.7
Feedback Type: Troubleshooting Report
Contributed by: Steve Davidson Saturday, February 19 2005 @ 07:36 AM PST
Product Platform: MacOSX
Used Product For: 1-6 months
System Info:PowerBook (15" Aluminum, FW800)
Mac OS X 10.3.8
2GB RAM
80GB HD
Comments
Seems to have stopped Working with Mac OS X 10.3.7 - Steve Davidson
I appreciate the feedback. I did remove the prefs. file, but it made no difference. I could see that the application was launching (based on the expanding icon / visual feedback), but nothing resulted. Nothing showed in the Dock, menu bar, etc. Noting showed in a ps list from the Terminal. No new prefs. file was created.I suspect that the application never completely loaded (so no crash log entry).
Note that I'm using 10.3.8 now (same problem as before).
Again, thanks for trying.
Tuesday, March 01 2005 @ 02:29 PM PST
Seems to have stopped Working with Mac OS X 10.3.7 - raytibbitts
SAME HERE!!Tuesday, August 08 2006 @ 05:48 AM PDT
Seems to have stopped Working with Mac OS X 10.3.7 - alex_soft
Try two steps:1) Remove "Sleepless Prefs" file form your Preferences folder
2) If you use "lid-closed" operation, try to enable and disable it some times.
(It is a limitation of Insomnia.kext, will be fixed soon)
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Monday, February 21 2005 @ 10:02 AM PST