Are electric blankets safe for people with peripheral neuropathy?

Yes....but: They can help. Get one with an automatic shut off so that you don't burn yourself. Also i would avoid the highest setting as your ability to realize that it is too hot may be compromised.

May cause a bun.: If you are not able to sense heat as good as you should this could result in a thermal burn.

May help cold: Not unique for many neuropathies to cause cold feet, especially at night, and the small fibre variants are the worst. However, try warm socks, which should help. If electric blanket kept on low setting, should be relatively safe, and most modern american blankets are designed to prevent burns.