Sleep is ammunition for the brain. All Soldiers need to be physically and psychologically strong and resilient. This is especially true of those Soldiers who operate at the “tip of the spear” as members of small teams in far-forward environments where the OPTEMPO is high, the margin for error is small, and the ability to access support functions (e.g., air support, evacuations, reinforcements) is lacking. The necessity for Soldier performance during nocturnal operations introduces an additional challenges for maintaining Soldier lethality. Ironically, although sleep is critical for sustaining military performance and effectiveness under such conditions, sleep loss is all but inevitable under such conditions. Sleep is also armor for the brain. Research shows that the more sleep that military personnel obtain, the better they perform and the less vulnerable they are to development of mental disorders like PTSD and depression. An emerging body of research also suggests that good sleep is linked to the body's ability to prevent and overcome infectious disease, further underscoring its importance to overall health.