Welcome Blenderman to LD4all! 
Think about it this way: when you’re LD’ing, you’re using time you would normally spend dreaming, and as such you’re just gaining time this way ^^ not to mention there’s easy techniques that require little to no time during the day, like autosuggestions, RC’s, and Lucid Living.
Hope everything goes well with your exams, and you have plenty of LD’s 