It depends on how u manage your time. Find time to exercise & try to learn something other then porn. I get tired also because I have been in this business for 10 years & its hard to get motivated & sales are not like before so it could be stressful. What I do, I take a few hours a day do some exercise, sauna, jacuzzi and massage once in awhile. Let me tell u a little secret, when ur spending to much time in GFY, its time to shut it down & get the fuck out.
