Why I quit buying energy drinks

I’m a bioengineering major and I often have to sacrifice sleep to study for exams, write research papers, and keep up with homework. so I used to have a few energy drinks a week, but a few months ago I started buying preworkout to save money and it’s been well worth it so far. are there any drawbacks to this? it’s saved me a bit of money so far, i know this isn’t healthy but sometimes you gotta do what you gotta do