Waheguru ji ka khalsa
Waheguru ji ki fateh
It's just the way we wake up in the moring and go to bed at night.
in the same way "guru granth shahibji" is wokedup every morning and then taken to sleep at night.
Guru Granth Sahib ji's Parkash should not be taken as a ritual. It should be considered just a sign of our respectful care of the legacy of Gur Sabad or Gurbani bequeathed to the world. Otherewise there is no such thing as waking up Satguru ji or making Guru ji to go to sleep. Gurbani does not accept such notions. Gurbani says,
SGGS page 479
ਭੂਲੀ ਮਾਲਨੀ ਹੈ ਏਉ ॥ ਸਤਿਗੁਰੁ ਜਾਗਤਾ ਹੈ ਦੇਉ ॥੧॥
Bhooli Malini hai eyo. Satgur jagta hai deo.
The worshipper with flowers ( preparing to wake up the deity) is misguided. The True Guru as the deity is ever awake.
SGGS page 592
ਮਃ ੩ ॥ ਇਕੋ ਸਤਿਗੁਰੁ ਜਾਗਤਾ ਹੋਰੁ ਜਗੁ ਸੂਤਾ ਮੋਹਿ ਪਿਆਸਿ ॥
Mahala 3. iko satgur jagta hor jag sootha moh piaas.
Thirg Guru ji says, Only the Satgur stays awake (all the time). The rest of the world is fast asleep slumbering afflicted with attachments to worldly things and desires.
What we have to be careful about is that our respect for the legacy of Gurbani does not become like the worship of Hindu deities where the stone ideal is woken up early in the morning by ringing the metal bell and then is bathed and perfumed up with incense burning and decorating with flowers etc.
In some sikh sects such things are happening more than other sikhs. For instance, in Nanaksar Thaths (followers don't say Gurdwaras but Thaath) Guru Granth Sahib ji is either fanned manually with a hand fan as well as provided with an air conditioner or electric fan during the night as well as day. In winter Guru Granth Sahib ji is wrapped up in a quilt to keep warm.
Sant Baba Nand Singh ji, the founder of this sect used to take bir of SGGS on his head outside and walking in winter mornings, of course respectfully, to warm up Guru ji in the sun in days when all modern electric heating facilities were not available.
A picture of Guru Nanak Dev ji is placed in the halls near the ceiling atop the place where SGGS ji is parkashed. This is supposed to be a copy of the painting that was painted by an artist at the request of Sant Baba Nand Singh ji who claimed that he saw Guru Nanak Dev ji during meditation and guided the artist to paint according to Sant ji's directions so that it had a likeness of what Sant ji had seen.