Sleep difficulty. Please advise.

I stay in Hyderabad and work for an e-commerce company based in the US. My work timings are 4:30 PM to 2:30 AM. However, I almost always end up working 2-3 hrs extra every day. I've always had sleep issues starting from my college days. But it's become worse after I started working, especially because of the weird shift timings. I'm not able to sleep for 6-7 hrs at a stretch. Instead, I sleep for about 2-3 hrs twice a day with a gap of 3-4 hrs in between. This has been going on for about 6 months now and it's severely affecting my health. I feel tired all the time, my eyes are always sore and I feel it is affecting my cognitive abilities as well. I've been fumbling a lot while talking and I can't think straight. Please advise.