I think stressful situations can definitely 'trigger' hypomania - my 'episodes' sometimes kick in after a meltdown or lack of sleep. I suppose it's your mind's way of throwing its hands up and saying, "okay, this is too much for me right now". Almost as if your mind and body try to escape/avoid the stress by going into overdrive. For me it can sometimes happen before a crash, too - my mind/body know it's coming, so they go a little crazy in an attempt to stop it from happening, if that makes any sense? Take care and look after yourself x