An acronym of "Me Sleep Again"
MSA is a common glitch in the 1998 line of Furby. It is sometimes referred to as a disease by the community.
When attempting to wake a Furby with MSA, it will say "me sleep again" / "kah way-loh koh-koh" and fall back asleep.
To get the Furby up and running, one would need to perform a restart by turning it upside down and sticking a finger in its beak. This may take a few tries.
There is no known permanent fix or 'cure' for MSA.
"My Furby has MSA, but it's fine, she always wakes up on my second try."