4 sentences about sleep deprivation. Could you explain my mistakes thanks Holland scientists proved that 8n order to prevent heart diseases you need sleep very well. Not less that 7 hours a night. The good sleep decreases the risk of stroke at 65 percent . The sleep less that 6 hours can be fatal. The risk of heart diseases soars at 48 percent. Moreover, sleep deprivation provoke overweight and hypertension which promote the onset of cardiovascular diseases.