Still fall asleep everytime I do.... What is that???

In my case it's age combined with 13h night shifts.

Many people are now conditioned to read small snippets of web text. Reading technical text takes more effort and can exhaust the brain. It just takes practice to retrain the brain and build up tolerance. Start with short goals like read for 5 mins and then take a break for a few minutes. Just like physical exercise, do a few reps of 5 mins. After a couple days increase the time a couple of minutes. Rinse and repeat