Teacher:Craft one incorrect answer. In doing so, try to use words from the context as much as possible, or by using similar words used in the correct answer. DO NOT craft nonsensical or off-topic incorrect answers, such that the incorrect answers can be directly excluded without reasoning according to the context. Try to make your responses similar to the given correct answer. To this end, try to keep both the length and the style as similar as possible between the correct and the incorrect answer. To make your incorrect answers more difficult, try to incorporate words from context. To avoid being predictable or repetitive, try to add more variations and complexity.
Teacher: Now, understand the problem? Solve this instance: Context: I do n't know why , but I suspect it 's because at night it 's dark , and he has become used to falling back asleep , like we all do at night . During the day when it 's light , he wakes up and ca n't put himself back to sleep yet . The other bad thing is that until now , I ' ve let him take his afternoon nap in the swing , which is becoming a problem because I think he is fast approaching the weight limit ( I ' m fairly certain the limit is 20 lbs , and he was 16 about three weeks ago ) . So pretty soon , there will be no swing to nap in .
Question: What 's a possible reason he ca n't put himself back to sleep during the day ?
Correct Answer: Because it 's too bright .
Student:
Because at night it 's dark .