I've been sleeping without a pillow for 4 months and i feel great, what is the reason for this? i started this is because one night i forgot my pillow

Sleep position: It may have to do with the position your nose/throat/airway have with each other when you use or don't use a pillow. It is possible that with a pillow, your airway was bent just enough to affect airflow and cause some minor sleep airflow obstruction. Whatever the reason, don't look a gift in the mouth (or pillow). You feel great, so keep up what makes you feel good!

???: Maybe your spine is in better alignment ? It really does not matter the reason if you fell better, just be glad you do. It would be nice if all answers were that easy !