Actually, the talk of sedation came from the Mccanns themselves!
Kate wrote that the twins had always been sound sleepers but this "seemed unnatrual" she said she was scared for them and checked her breathing and "wondered" if madeline had been given a sedative by her abductor to keep her quiet.
Then, after speaking with police on 3rd august they said of kate
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their friends & family also kept mentioning the possibility of sedation
2nd Oct, Kate's mum said it.
19th Nov Gerry said the twins slept so soundly "which does make you wonder if substances were used."
2008 a mother of one of the Tapas friends also said it.
Fiona Payne also said "it seemed weird they didnt wake up"
And in Oct 2009, 2 former detectives, employed by the Mccanns said they were "convinced" the abductor used something like chloroform.
The twins unusually deep sleep raised eyebrows and I guess this was their way of putting the spotlight on the abductor. Or perhaps they were worried her body would be found and were planting the seeds to explain any trace of toxins.