Every time you switch between work, your brain needs to find the information and context for that task.
Simply put, multitasking is a myth. While it might feel like you’re doing more than one thing at the same time, when you attempt to multitask you’re actually forcing your brain to quickly switch between tasks. Every time you switch between work, your brain needs to find the information and context for that task. Not only does this take more effort than simply focusing on one to-do, it also exhausts your brain.