For the past few days, I've been yawning a lot, much more than average (once every few minutes I feel the need). If I'm not yawning I'm breathing in as deep as I can to get similar "satisfaction". Often I cannot get the "satisfaction" from these and so the urge grows and grows, meaning it can get quite uncomfortable. When I do manage it, the urge is back a few seconds later. This is whether I'm tired or not, almost all day.