My friend doesn't sleep well and lives alone in a van in the mountains and preps for doomsday, what do you recommend to resocialise him?

Re-socializing someone who lives in isolation and has a doomsday mentality can be challenging. Andrew Huberman from the Huberman Lab might suggest the following general strategies for enhancing social interaction and well-being:

1. Use of Technology: Encourage your friend to use video calls and social media to stay connected with people. This can provide a sense of community even from a remote location.
2. Gradual Community Engagement: Suggest they participate in local community events even minimally. It can start with attending a market or a local gathering.
3. Physical Activity: Regular exercise can enhance mood and reduce anxiety. Group activities, if available, can combine physical and social benefits.
4. Structured Activities: Engaging in structured activities like clubs or online forums about their interests (e.g., survival prep) might help them connect with like-minded individuals.

For personalized recommendations suited to specific scenarios like prepping for doomsday, it might be beneficial to consult relevant professionals who understand both social psychology and survivalist mindsets.