The verb 'falloir' only has one form - an impersonal il ---- Il faut
It is similar in meaning to the impersonal 'on doit ..."
If you also look at my answer to a similar question:
Hope this helps!
You can say either:
On doit dormir la nuit. Or Il faut dormir la nuit.
Il faut already means "one must" or "it is necessary".
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