ick Ross says he hasn't had a good night's sleep in 5 years

Rick Ross says he hasn't had a good night's sleep in 5 years -- and claims the lack of sleep is what caused him to suffer two seizures in a matter of hours last month.

Ross appeared on BET's "106 & Park" today ... his first interview since he battled through a pair of mid-air seizures back on October 14. Ross says his doctors tested him for cancer, diabetes, HIV and more ... but the tests revealed the rapper is "totally healthy."

In the end, Ross says, "It was a case of me not getting enough rest, enough sleep" ... but now, The Boss says he's making sure to leave room for naps.