Bella Figura
Bluelight Crew
i still cant imagine 5mg will have any effect tho.
trust me it will :D
Also give it some time to work its magic, you don't wanna snort the lot in a moment of "oh it must be weak I can't feel anything".
If you want to get any sleep I'd avoid redosing more than once. I dunno how to describe its smell (I'm not very descriptive, but if you trust your source and they've only given you 100mg its probably PV).
Booze/benzos/weed would also be a plus when trying to get some sleep.
If in doubt with your eyeballing, the skinniest thumbnail sized line should do the trick.