It is related to nystagmus. I thought I only did it on purpose, but when I am tired I also sometimes do it involuntarily.
From the link:
A slightly different form of nystagmus may be produced voluntarily by some (8% of) people. Some can sustain it for up to 35 seconds, but most average around 5 seconds.[19][20][21]
No, it means only people with good pensions can retire early. Incidentally, this is by design those with high wages since these are the basis of earning pension. However, the ones that may actually need to retire early due to the stress of hard menial labor are not in this group of high earners.
In effect we will see people at offices doing easy work close their pcs and have an office retirement party at an age of 65 that poor Olga of 70 years (or more) will have to clean up.