[header] How to know if you're sleep deprived [title] Be aware of decreased cognitive function. [step] It's no surprise that a lack of sleep can cause irritability and changes in mood. You may actually develop a mood disorder if you're consistently sleep deprived. 
Disruptions in the sleep cycle have been strongly connected to depression and a reduced quality of life. [substeps] You may also feel more anxious and lose your motivation to do simple everyday tasks.