No ERGONOMIC chair is good for sleeping on, just avoid it. The way the seat and backrest/lumbar pieces are made are to support mostly an upright position, and literally falling asleep on a chair that has good support will put pressure on the wrong places inducing in numbness (nerve pressure) and bad circulation (blood vessel pressure). Not to mention most headrests are very lightly padded and made for upper nape resting as opposed to a pillow which would spread pressure along all of the nape down to the upper neck. This last one may cause the most stress, and that's even if you have a headrest because if you don't your head and spine will tilt backwards which is even worst. THAT SAID, there are some specialty lounge chairs that are somewhat ergonomical from the top brands such as the Leap lounge or whatever it's called. It's a 3k+ affair though and I have no idea if it's any good due to its rarity making it scares to find unbiased opinion online. I'm speaking from experience falling asleep myself in multiple decent chairs such as the Haworth Zody with a custom headrest, the Haworth Fern (custom pillow-sleeve at its top) and the Steelcases Please V2 (no headrest, but I can rest my head near its top). Horrible sleeping experience at any level, I wake up all aching after minutes of discomfort. The body just naturally rejects it. Great chairs for 30min-1h of recline playing games or watching media otherwise, but I still need to take a break or two in the longer movies. Also, even for short stint recline, you will absolutely want a footrest that's at least almost as tall as the seat height you're using. Any "racing/gaming" chair that will have a leg rest attachment will once again out pressure on all the wrong places of your calves. More on reddit.com

Couple questions first... Why is the desk not facing the wall? Do clients sit in the grey chair or is that an additional space for you? Can you post pics of the rest of the room? More on reddit.com

Have you considered adding something like this? I have an amazing chair thats rated for 24/7 use and is found in 911 call centers and government agencies and still use one of these. I only use the seat cushion part not the back but it makes sitting for prolonged sessions so much better. https://thecushionlab.com/collections/all/products/ergonomic-seat-cushion More on reddit.com

A high-back Setu Lounge with Ottoman, Cosm highback, Steelcase Leap Lounge. But honestly these aren't going to be to great for office work, maybe Cosm might still work. More on reddit.com