In politics as on the sickbed, people toss from one side to the other, fancying that they will be more comfortable.

Johann Wolfgang von Goethe (1749–1832) German poet, statesman, scientist
Conversation with Friedrich von Müller (29 Dec 1825)
    (Source)

In Biedermann, Goethes Gespräche, Gesamtausgabe, #2379 (1909). Usual variant: "In politics, as on the sickbed, people toss from one side to the other, thinking they will be more comfortable."