I hear its bad to wash your hair daily, but when I wake up my hair smells like old people. Suggestions?

When I wake up , my whole room smells like old people . I change my pillow cases quite often ( thats soo nasty if you dont .So even even think thats the problem ) but I smell that old people smell on my hair ( EW !!! ) . So I wash it EVRY DAY !

What can I do? I want my hair to be healthy .
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