Summary

Likutei Halakhot/Orach Chayim/The Morning Hand Washing

Therefore, God imprinted the instinct in man that when the mind is too confused and tired that one falls asleep, closing one's eyes and submerging the mind, completely letting go of one's consciousness and intellect. This is the submergence, surrendering oneself into the Absolute Good, where all confusions, including all judgments, troubles, pains and obstacles, disappear and are all submerged into the ultimate purpose. This is why sleep is innate to man and to all creatures.
Source: Wikisource

Likutei Halakhot/Orach Chayim/The Morning Hand Washing

But when one is haughty and says 'I shall rule' and seeks to draw 'kingship' to himself, this is because in his haughtiness, he believes that he has already achieved some intelligence, that he is a scholar, a kabbalist, a tzaddik, and deserves some status of power. He thus desires to overturn order and take the Malchut for himself, as if he has power and knowledge to sustain the Malchut which is sustained mainly by wisdom, to draw wisdom into disorder and to empower disorder over order.
Source: Wikisource

Likutei Halakhot/Orach Chayim/The Morning Hand Washing

But when disorder, represented by judgments, is empowered, which is on Rosh Hashanah, when the world, corresponding to disorder, was created, and on which Adam and Eve sinned, thus empowering disorder, we must at this time completely surrender ourselves into sleep. In other words, we must completely relinquish and abandon our intellect, as if we have no knowledge at all, but rather declare G-d as King with utmost faith and simplicity, without any sophistication.
Source: Wikisource

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