Sefer HaMiddot, Sleep
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א. מִי שֶׁהוּא מְקֻדָּשׁ יוֹתֵר, הוּא רָחוֹק מֵהַשֵּׁנָה יוֹתֵר.
The holier a person is, the less sleep he requires.
ב. עַל יְדֵי רִבּוּי הַשֵּׁנָה וְהַתְּנוּמָה, עַל יְדֵי זֶה דּוֹחֲפִין אוֹתוֹ מִמֶּרְכָּבָה דִּקְדֻשָּׁה, וְנִשְׁתַּנֶּה פָּנָיו, וְנִתְקַלְקֵל צֶלֶם. אֱלהִים.
Too much sleep and slumber causes a person to be pushed away from the seat of holiness. His face changes and his Godly image is marred.
ג. חֲמִשָּׁה עָשָׂר "שִׁיר הַמַּעֲלוֹת" שֶׁבַּתְּהִלִּים מְסֻגָּלִים לְבַטֵּל הַשֵּׁנָה.
Reciting each of the fifteen psalms that begin “A song of ascent” (Psalms 120-134) is a segulah for eliminating sleepiness.
ד. מִי שֶׁאֵינוֹ יָכוֹל לִישׁן, יַעֲלֶה עַל מַחֲשַׁבְתּוֹ אֱמוּנַת תְּחִיַּת הַמֵּתִים.
A person who finds that he cannot sleep should think about his belief in the resurrection of the dead.