Sarabhai vs Sarabhai

Rosesh's Insomnia (1x16)

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Rosesh, his sleeplessness and his untimely violin playing disturb everybody to the point that Sahil makes him see a psychoanalyst. Rosesh disappears outside the house in the night and returns in a wheelchair. To the surprise of the Sarabhais, he is also drowsy. What could be the reason for this?