It is generally not recommended to sleep with your dog if it has fleas. Fleas can bite humans as well as pets, and they can transmit diseases to humans. Fleas can also cause allergic reactions in some people, leading to symptoms such as itching and rashes. If your dog has fleas, it's important to take steps to eliminate the fleas as soon as possible to prevent further harm to your dog and to prevent the fleas from spreading to other areas of your home. This can include using flea-preventative products, regularly grooming your dog, and keeping your yard and home clean. If you are concerned about fleas, it may be best to avoid sleeping with your dog until the flea infestation has been completely eliminated. If you do need to sleep with your dog while it has fleas, be sure to use a flea prevention product on your dog and to use protective measures, such as wearing long sleeves and pants, to prevent flea bites.