Do you think it's possible to "train" some of your 'bodily functions'?

Like clock-work, my husband can wake up, get the paper and a cup of coffee and ‘evacuate his bowels’ before getting into the shower and getting ready for work. Me, not so much. It’s a ‘crap shoot’ for when or if I’m able to make a movement any given day. (bad pun, ok… Groan!)

Do you think there is any way that a person can train his or herself to “go” at a certain time of day?
(if you answer yes and you have this ability, please share your secret)