I am starting to wonder if it has anything to do with moon phases, or weather patterns, the time of the year...etc.
It seems that all these things do indeed effect out glider's moods and eating habits as well.
Also barametric pressure changes can effect them (or atleast do mine).
With fuller moons, there is more outside light coming through the windows and mine tend to bark more.
With rapid barametric changes, they tend to stay in their pouches
more, play less, eat less.
There have been threads in the past where people have discussed what changes their gliders go through.