Mental rest is different from sleep—it's what happens when you stop directing your own attention, which is when your mind actually consolidates what it's learned and makes new connections. Most productivity advice is built on preventing this, which is why you're probably more tired than you think.
Peri can explain this concept, give practical examples, help you decide whether it applies to your situation, or recommend a journey if appropriate.
Explore related journeys or tell Peri what you're working through.