Having some background noise that's not too distracting helps. Any upbeat music without lyrics
Reading my readings out loud, or having any audio transcribing app/extension read it to me
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For any type of work, I like using the pomodoro7 technique (it's basically a timer set in 25 minute intervals, with short breaks in between). I find that having a sense of urgency helps me focus my energy and stay engaged with the material. The awareness about how I'm spending my time also makes me less inclined to waste it being distracted. As for the falling asleep part, a bit (or alot) of coffee, plus instrumental music like Fahmida suggested usually does the trick for me ☝🏼