Who, apart from you, has described Madeleine as a light sleeper? Who, apart from you, has said she would wake the twins if she woke up?
I read your post but unless you have some evidence to support what you say, it's just an unsupported opinion.
Sean and Amelie had always been perfect sleepers, and Madeleine had outgrown the restlessness of her babyhood......[madeleine]
So, all three could be expected to sleep so long as no lights were turned on and no doors were opened and closed. That's not, in my opinion, a description of 'perfect' sleepers, whatever that means. Like all children, they woke up occasionally; Aunt Janet says that's why the parents checked on them. She says they didn't let the children cry and she still, a year after the event, didn't seem convinced by Madeleine's story about the crying.
The children would occasionally awake during the night, particularly when they wanted to eat or be changed. Kate and Gerry would get up and take care of them it was for this reason they wanted to check on them when they were out....... As parents, Kate and Gerry did not let their children cry......They checked on their children constantly; the children always came first so that their routine was not disturbed.........Relative to the allegation that Madeleine made regarding Sean's crying, I do not have any idea what possessed Madeleine to make such an affirmation and also would state that Madeleine had a very fertile imagination.
http://www.mccannpjfiles.co.uk/PJ/JANNET-KENNEDY.htm
Janet knew the kids back in Rothley where they had separate rooms I presume (for Kate still talks about Madeleine's bedroom. Gerry mentions that the twins may have woken Madeleine.
"---- When asked about the time he went to check the children on the night of Madeleine's disappearance, he states remembering that he did it, according to his watch, around 21:04. He remembers that once inside the apartment he thought strange only the fact of the door to the children's room being slightly more open than how the defendant had left it when he and Kate left for dinner. However, he puts the hypothesis of [proposes; suggests] it having been Madeleine opening that door after having woken and having got up, possibly to go to her parents' room. On this occasion the three children were lying in their beds and asleep, he is sure of that. "
also "--- The third check was made by Kate at around 22:00. He does not know how long it was before Kate returned, but he does remember that shortly before she returned he was thinking of going to see what was going on, as it seemed a long time and he thought that one of children might have woken up."
Kate: "With the exception of what has been described above, during the holidays, she does not remember if any of the children was awake during the night. However, in England Madeleine sometimes woke up during the night, around 2 ' 2:30 AM and went to her parents. During holidays it was normal for the children to be awake by 7:30/8:00, in England, at home, they would normally wake between 7 and 7:30 AM."
Gerry McCann 10th May "----- He followed the normal route up to the rear door, which being open he only had to move [slide] it, that being the way in which he entered [was entering] the lounge, he noted that the children's bedroom door was not ajar as he had left it but half-way open, which he thought strange,
having then put together the thought of MADELEINE having got up to go to sleep in his bedroom so as to avoid the noise produced [created] by her siblings."
So at the time Gerry thought it likely.