If one is so tired that he cannot do a manual landing he should make sure that the CAT III sensitive areas are protected, otherwise the outcome could be something along the lines of the singapore airlines incident in MUC with their 773. in rather benign conditions, 7 to 8 kts roughly along the runway.
Over here we may not use the autoland system beyond its limits except in an emergency, and the wind limits do include all gusts. However, the 737 is a very easy plane to land manually in 40 kts crosswinds anyway, so there is no need for autoland.
Sadly GLS isn't yet certified for lower than CAT I operations, but we did quite a few CAT IIIb trials at EDVE and it works like a charm, actually better than the ILS and without the need for protected areas. But the number of installations is still very low and many airports do not see why they should invest in it if they still have to maintain their ILS anyway for those old fashioned aircraft without GLS capability.