It's been almost a year since my tonsillectomy. mmy breath is begin to smell bad after a night sleep. what is causing this?

Morning breath: Morning halitosis occurs because saliva production is reduced while we sleep, leading bacteria in the mouth to produce sulfuric compounds that build up. Brushing and flossing before going to bed may help, but morning breath is not unusual. See your dentist for further discussion. http://www.webmd.com/oral-health/guide/change-your-breath-from-bad-to-good