I take sleep medicine b/c I don't sleep well...unisom is what I take. However if ever I don't take it..I wake up in the middle of the night with the hiccups. It never fails. Once I wake up and get up and get something to drink (usually milk is the only think that helps) they go away. usually in 5 min. I am never up longer that 8 min. Sometimes it happens more than once in a night but rarely. I assumed I was breathing wrong but if it doesn't happen when I take sleep meds then is it something else??????