She had Narcolepsy or sleeping spells. She could fall asleep any time and any place. This was caused by a severe blow to the head by a 2-pound iron weight thrown at another enslaved African, but it hit Harriet in the head when she was about 12 years old. Harriet believed that her hair, which "had never been combed and... stood out like a bushel basket" might have saved her life. After this accident, she started getting dreams. A devout Christian, she strongly believed her dreams to be indications from God. Harriet Tubman freed herself in 1851 using the system known as the Underground Railroad. The Underground Railroad was a network of secret routes and safe houses used by enslaved Africans to escape to free states and Canada with the aid of abolitionists and allies who were sympathetic to their cause. When Harriet Tubman found out that she had crossed the Mason Dixon Line and she was free, she said, " I looked at my hands to see if I was the same person now that I was free, there was such glory over everything, the sun came up like gold through the threes, and over the fields, and I felt like I was in heaven. “After freeing herself from enslavement, in Harriet Tubman returned to Maryland to rescue other members of her family. If you were an enslaved person and you would like to escape, someone would sing ‘Swing Low Sweet Chariot' as a signal and you would be smuggled that night to different safe houses until you reached the North or