לְמַ֨עַן תִּירָ֜א אֶת־יְהוָ֣ה אֱלֹהֶ֗יךָ לִ֠שְׁמֹר אֶת־כָּל־חֻקֹּתָ֣יו וּמִצְוֺתָיו֮ אֲשֶׁ֣ר אָנֹכִ֣י מְצַוֶּךָ֒ אַתָּה֙ וּבִנְךָ֣ וּבֶן־בִּנְךָ֔ כֹּ֖ל יְמֵ֣י חַיֶּ֑יךָ וּלְמַ֖עַן יַאֲרִכֻ֥ן יָמֶֽיךָ׃
supaya engkau, anakmu, dan cucumu takut akan Yang Mahakekal, Allahmu, seumur hidupmu, dengan berpegang pada semua ketetapan dan perintah-Nya yang aku perintahkan kepadamu, dan supaya panjang umurmu.
Likutei Halakhot
This corresponds to washing the hands in the morning. Sleep corresponds to bitul-submergence into the Absolute by closing the eyes, which is the root of sleep (see LM 1 54). For during sleep, we bond with the World of the Future, representing bitul/submergence. From LM I 7, on the story, "Rabbi Eliezer was sleeping," we also see that sleep corresponds to submergence, to, "No eye has seen." In fact, the main reason why God puts man to sleep is for these above reasons, to escape from the judgments and suffering that are all caused by a confused mind, as we have spoken about elsewhere. Man has been sent into this world for one reason alone — to fight a holy war against desires and confusions and to bind one's thought to God at all times. But this tires the mind. 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. Therefore, it is possible to attain very sublime perceptions during sleep, since one is then submerged into the Light of the Ein Sof, by means of which one is able to perceive great things, as stated in the holy Zohar on the verse, "Who will ascend God's mount?" (Psalms 24:3; Zohar 11 195b). Therefore, one must wash the hands with water upon awakening from sleep, for wakening from sleep corresponds to returning from submergence, when judgments and confusions, the cause of all impurities, seek even more intensely to overwhelm the person, as explained in the lesson. Specifically then one must muster more strength to subdue them by the Torah that one draws from the Impression, which corresponds to water. This is why we wash the hands with water immediately upon awakening from sleep. Since awakening from sleep corresponds to submergence, we must immediately evoke the waters of Torah in order to abolish the spirit of impurity that rests upon the body, only on the hands. The forces of judgment and confusion stand in ambush over the human body during the submergence, waiting for the moment when a person's consciousness will return so that they will gain even firmer grip on him. Therefore, we must be careful to banish them immediately upon awakening from sleep by purification with water, which evokes purity and sanctity from the waters of Torah that are from the Impression of the submergence, from which all suffering and judgments come after one has returned. As our Sages of Blessed Memory said on the verse, "Which I have commanded you ; today" (Deuteronomy 6:2) (the words of Torah should be new in your eyes everyday" (Sifri ad loc). Hence, one must receive the Torah anew every day, for through sleep, which corresponds to submergence, one receives a renewal of the Torah in order to counter judgments and impurities that seek more than ever to overwhelm a person specifically at this time. Fortunate is he who attains this to perfection, attaining new and authentic Torah insights every day. However, even the majority of people who cannot attain this should at least do their best to study Torah in the morning upon awakening from sleep. Jewish literature is full of the importance of rising early in the morning to study Torah in order to quench the soul's thirst, to banish suffering, judgments, the forces of evil and all confusions by means of the Torah that one receives from the impression. Therefore, even someone who is not really able to attain new Torah insights must at least make great effort each and every day to study Torah with renewed enthusiasm and passion, that it will be literally "as new" for him, for this too is considered a renewal of the Torah, as explained elsewhere. This corresponds to tzitzit, tefillin, kriat shma and prayer, all of which represent a renewal of the mind that is drawn upon each Jew every day. All this is evoked by the shining and the impression of the Submergence into the Absolute, which corresponds to sleep.