There's difference between not requiring more hrs of sleep nd insomnia..
If insomniac the day time energy levels are low nd the person feels lethargic all the time.
Self made Billionaires, CEOs, from Elon musk to apple's tim Cook they sleep only for 3-4hrs..
Even in sushant's case that was how he functioned I guess, he was always studying exploring or practicing.. Had he been depressive type of insomniac, he couldn't have made it to top either in itv or anywhere else.
Regardless, not getting enough sleep is bad for your health. I’m surprised you used Elon Musk as an example, he himself has said he’s bipolar time and time again.
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