No there are no long term effects ...
i ftnd this is me sometimes i dont think theres any long term effects at all they just want to b close to u but also let him no its ok to sleep in his own bed to .... Maybe he is scared also ... Let me know how it goes take care
i found this artical intresting http://www.timesonline.co.uk/tol/news/uk/article1083020.ece