You fired your employee for being sleepy in the morning? I think he’s better off not working for you and I’d avoid such employers like you like the plague. Im productive after a coffee in the morning and do arive sleepy at work and thats not your damn business. Getting the job done is a better metric and if you want 100% consistency look to invest into robots. You can’t expect people to submit everything to you. What do you do for them beside paying for their work?