Are the glorifications of "When you go to your bed, glorify Allah thirty-three times, praise Him thirty-three times, and magnify Him thirty-four times" to be recited before every sleep, or are they specific to the nighttime sleep?

Reciting the remembrance (adhkar) before sleep is a Sunnah (definition). The hadith (definition) mentioning it does not specify that it must be recited before every sleep, nor does it restrict it to nighttime sleep. However, Sheikh Al-Uthaymeen holds the view that these are for nighttime sleep, and there is no harm in reciting them for daytime sleep.