Moreover, when stock markets fall sharply, interest rates usually go down, which causes bonds to go up in value and reduce the losses in your portfolio. (moneysense.ca)
You may consider monthly lump sum installments or may be when markets falls on any given day. (relakhs.com)
It's also normal to feel anxious during sell - offs or uncomfortable as we wait and see if markets fall further. (blog.fundx.com)