Due to the strain this put on my neck and my head , I woke up with a migraine . A couple years back this could have been avoided . A couple of years back NyQuil did exactly what it 's commercials said it would do and helped you get your zzz 's .

Give answer the following question using evidence from the above passage: What may be the reason Nyquil no longer does what it 's supposed to do ?
They 've done something to change it and now it does not work the same .