This is an incomplete question. Without further information, it's impossible to answer :( But here's some ideas . . .
Guidelines for narcolepsy - Put your hair in a braid and hang from the wall so you don't fall down
Walking: Try putting 1 foot in front of the other
Puberty, menopause, substance abuse, disease and pregnancy are the biggest ones.
Based on data it can change per time you do the experiment, thats why repetition is key to check for errors
