Ghosts

Sometimes a thousand twangling instruments
Will hum about mine ears; and sometime voices
That, if I then had waked after long sleep,
Will make me sleep again; and then in dreaming,
The clouds methought would open, and show riches
Ready to drop upon me, that when I waked
I cried to dream again.
--The Tempest, Act. III. Sc. 2
Wm. Shakespeare