I am 26, thin, in good health, I don't snore, I am tired all the time, severe heart palpitations, all tests and bloodwork came back normal and then I got married and husband caught me not breathing in my sleep. Severe sleep apnea. I stop breathing 35 times an hour! So many people have this and have no clue because they don't fit the stereotype. I never even remember waking up in my sleep. A sleep study is worth a try!