Relaxation and stress management can help improve your sleep quality, therefore self care promote adequate sleep which is good for your mental health.

Self care builds relationship in the sense that when you are happy, you'll be able to maintain quality relationships with people.

You're actually right, when talking about sleep, it's something that we need to put more light on it because today it's very hard to see people having good sleep. Have you heard of this statement before... Na rich man pikin dey sleep?