After 7 years of peaceful nights and easy-ish bedtimes, DD is currently struggling to get to sleep at night. She is tired, and timings seem appropriate, she doesn't appear concerned about anything in particular. She simply can't get off, and then starts to worry that she won't be able to get off, and works herself up. She can fall asleep on the sofa easily if I'm beside her. Equally is asleep in 60 secs if I lay with her for a while either in her bed or ours. She's not a particularly needy child, so what might be going on do you think?