I have located the graves of a few of my Stratton ancestors. Mary Stratton Fox is buried in Buckingham Cemetery in Glastonbury, Connecticut. Her grandfather, Enoch Stratton is buried just down the road in Old Eastbury Cemetery, but I haven't been able to locate any other Stratton graves. The first two generation of Strattons in Massachusetts are probable buried somewhere in Watertown or Cambridge but the third generation Stratton, Samuel should be buried somewhere in or near Concord, where he passed away.
|"Concord, Massachusetts, Town Clerk, Vital and Towns Records, 1627-2001." Images. FamilySearch. https://familysearch.org : accessed 2013.|
Even if Samuel Stratton was buried in Sleepy Hollow Cemetery in Concord he wouldn't have been buried where the Headless Horseman was located. That Sleepy Hollow is in New York, not Massachusetts.
[Note: A number of famous authors are buried in Concord's Sleepy Hollow Cemetery including: Louisa May Alcott, Ralph Waldo Emerson, Nathaniel Hawthorne, and Henry David Thoreau.]