Meditations on First Philosophy

"And just as a captive who in sleep enjoys an
imaginary liberty, when he begins to suspect that his liberty
is but a dream, fears to awaken, and conspires with these
agreeable illusions that the deception may be prolonged, so
insensibly of my own accord I fall back into my former
opinions, and I dread awakening from this slumber, lest the
laborious wakefulness which would follow the tranquillity of
this repose should have to be spent not in daylight, but in
the excessive darkness of the difficulties which have just
been discussed."

Meditations on First Philosophy, René Descartes.

nothing more to add.