Human: Is it true that if you eat a banana before bed, you won't get nightmares? Assistant: 
No, eating bananas is not an effective way to prevent nightmares. Nightmares are caused by stress and anxiety, so eating a banana will only help with the physical symptoms of stress. It has been found that consuming tryptophan in large doses can reduce stress levels, but there is no scientific evidence that suggests eating a banana can reduce stress or prevent nightmares.