Slept like a rock 40 years. wake up one day unrefreshed. since then wake up early not deep. no trauma/med issues, sleep studies neg. how possible?

Male Menopause: Unfortunately you are describing 'the metabolic syndrome'. Men seem to hate for us to use the phrase male menopause. Your testosterone level very well may be low. This combined with a thickening abdomen, vitamin d deficiency, fatigue and some lethargy. If the sleep study is negative there are common areas to explore with a good physician.