In case you didn’t know, sleep is critical to proper functioning. It gives our brains a moment to rest, allowing neurons to reconnect or make new connections, thus consolidating memory, and improving focus, attention, and vigilance the next day. Studies have shown that losing sleep can even lead to the destruction of brain cells, and that’s not including the effects of lost sleep on the immune system and the heart. Now, a new study shows that getting a poor night’s rest might also encourage the development of Alzheimer’s disease.