What does Judaism have to say about sleep? 3b - the Shabbes schluf

Yosef Karo already wrote (Shulchan Aruch (Orach Chayim 231) that even if he sleeps a little his intention should not be for bodily enjoyment, but rather to strengthen his body for the service of the Holy One (see in Shulchan Aruch). This entire paragraph is the word of the Living God. And so it is good to say verbally before sleep “I am laying down to sleep so that my mind will be clear and calm in order to to serve Hashem.”

And when he lies down for a short sleep on Shabbat let him say “I am laying down to sleep for oneg shabbat as our teachers said (Yalkut Reuveni Va’etchanan etc) ‘Sleep on Shabbat is a pleasure.’ and Psalm 90”.

The one who loves life should not take too much sleep for it is one sixtieth of death, and because the life we should seek to acquire through them [mitzvot] is eternal life.

And before he goes to sleep he should say “I am laying down to sleep so that my mind will be focused and calm to serve my Creator” And on Shabbat he should add a little [ie. sleep a bit longer than on weekdays] for oneg shabbat, as our rabbis say - שינה בשבת תענוג - sleep on shabbat is a mechaye!

“May it be Your will that I will merit to earn in my sleep and will not lose by it. And in Your great mercy may You take pleasure in us and want us, (Psalm 90 quote).” But he should force himself not so sleep if he can, and just have a good doze, for an hour of Torah and good deeds in this world is better than all of the World to Come - this is an important principle.

And the holy rabbi Pinchas of Koretz may his memory be a blessing says that all creations sleep and even the waters sleep for if they didn’t, they would destroy themselves - but because the waters have a small life-force they sleep little. That means to say, according to [the quantity of its] life force does a creation sleep. And a human being has more life-force than all creations, so s/he sleeps more than all of them, so that s/he can be renewed more.

See above for why it is a mitzvah to sleep on Shabbat even in the day: sleep on Shabbat is a pleasure. For on other days a person has the life-force of just one soul so it suffices for him to sleep at night. However, on Shabbat he has life-force from two souls, therefore he needs to sleep also in the day. It appears to me:

For in his sleep he submits his soul to the Eternal Well as mystically alluded to in the verse “They are renewed every morning, ample is Your grace” (Lamentations 3:23) where the opening letters spell “RaCHeL” which is the Well indicated by the phrase “Beyadcha Afkid Ruchi” [In Your Hands I entrust my spirit” (Psalms 31:6)

Sleep on Shabbat is a pleasure. So long as he does not have too much sleep such that it leads him to wasting [time that could be used for] Torah. For Shabbat was only created for studying Torah.

There is a midrash: the Torah said to God, when the Children of Israel will enter Eretz Yisrael one will run to his orchard and one to his field, and what will become of me?

He said to her, I have a spouse that I will partner you with, and she is named Shabbat. For they will be free from their work and will be able to attend to you.

And it says in Tanchuma “Moses gathered (Exodus 35:1). Regarding this the Aggadists say from the start to the end of the Torah there is no portion which starts with “kehillah” except this one. And why is that? Because God said to Moses ‘Go down and make large congregations on account of Shabbat so that all future generations will learn to gather communities together every Shabbat, and to study in synagogues and houses of learning and to learn Torah in public in them.’

Another thing. “And Moses gathered”. God said to Israel, ‘If you gather together every Shabbat in synagogues and houses of learning and read from the Torah and Prophets, I will reward you, as if you coronated me in my world, as Isaiah explains “You are My witnesses and I am God” (Isaiah 43:12) - you testify that I am God in the World.’