for the past week ive noticed that my clutch pedal has been low, and when the temp is below 45ish and the car sits over nite, the pedal sinks to about 1.5-2in of the floor. i can pull it back up to height. i have a stainless line, and wasnt sure if it would be the slave cylinder or a leak somewhere in the reservoir. there was plenty of fluid when i checked last tues

 

I hope it is not your clutch going bad - earlier in the year I had a similar problem but the clutch went all the way to the floor. Turned out the clutch plate was gone and had to replace.

Good luck...

 

If its not the slave cylinder rod sticking due to rust or w/e, it might be air in the clutch line. Try to re-bleed it

 

Rebleeding the slave should do the trick