>>2751591The down fill and volume is less important than the loft but if had the iso std or whatever it's believable. Down can be effected if you were compressing or shifting the down but should bounce back quickly unless you were constantly compressing it. Most sleeping bags also have slightly less fill on the bottom and it tends to be more compressed so if you rolled over that might be an issue.
If drafts were an issue it could be that you didn't close up draft collars. Shifting around a bunch can cause a 'bellows' effect where you push the warm air out. and of course you could just sleep cold.
Next time try to identify where you are feeling cold. Feet, face, back, etc. and make sure to give your bag a good shake to loosen up the down before bed, and back into place if that's relevant.
